Sink



FIG. 1 is a top front perspective view of a sink showing our new design;

FIG. 2 is a top plan view shown on an enlarged scale thereof;

FIG. 3 is a front elevation view shown on an enlarged scale thereof;

FIG. 4 is a right side elevation view shown on a greatly enlarged scale, the left side being a mirror image thereof; and,

FIG. 5 is a partial cross-sectional, view shown on an even greater enlarged scale taken along line 5—5 shown in FIG. 2 thereof. 

The ornamental design for a sink, as shown and described herein. 